2011 Toyota Tundra Double Cab Owners Manual - Page 193

1-7. Safety information Center rear seat Latch the hook onto the inner anchor strap ring and tighten the top tether strap. Make sure the top tether strap is securely latched. Inner anchor strap ring Lower the head restraints of right and center seats. n Left rear seat Raise the head restraints of center and left seats. 164